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NFT Ownership Verification (Token-Gating)
x402
NFT Ownership Verification (Token-Gating) is a paid API for AI agents from x402.professorsausages.com, paid per call via x402, $0.002/call, status unknown (last checked 2026-11-01).
Performs a real-time, live ownership check to verify whether a given wallet address holds a specific NFT on a given blockchain chain.
Price / call$0.002
Success—
StatusUnknown
How this service works
Realtime holds-or-not ownership check (token-gating) — ALWAYS live
Output
Returns a live boolean indicating whether the specified wallet address currently holds the given NFT (token-gating result), along with supporting ownership details such as contract address, chain, token ID, and any relevant scam or metadata signals.
Example use cases
Example prompt
“Can you do a live on-chain ownership check to verify whether wallet 0xAbCd...1234 actually holds token #42 from the NFT contract 0xDead...Beef on the Base chain?”
Technical details
Endpoint
GEThttps://x402.professorsausages.com/nft/:chain/verify-ownership?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a guaranteed live, real-time on-chain NFT ownership check — not a cached snapshot — for token-gating, access control, or scam verification purposes. Prefer this over static indexers when freshness is critical and the result must reflect the current chain state.
Side effects
- Invalid or malformed wallet address returns a validation error
- Unsupported chain identifier returns an error indicating chain is not supported
- NFT contract address not found on specified chain returns not-found error
- Rate limiting or payment failure returns 402 Payment Required
- RPC timeout or chain node unavailability causes delayed or failed response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| chainrequired | string | Which chain the address belongs to. base and ethereum run full on-chain mode; the rest are list-only mode. |
| addressrequired | string | The address in that chain's native format (0x… for EVM, base58/bech32 otherwise). Checked against that chain's shape BEFORE the payment gate — a malformed address is a free 400, never a 402. |
Tags
x402
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Zero review prompt (fires after every successful call)
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